Fix: paper-fab fill color was incorrectly set in cde-fab

Follow-up to #3514. This had no visible effect because the chosen color coincides with the default.
Merge pull request #3640 from ussuri/small-fixes-3

Fix: paper-fab fill color was incorrectly set in cde-fab
Merge remote-tracking branch 'upstream/master' into small-fixes-3
Better separation from background for in-editor FABs
Merge remote-tracking branch 'upstream/master' into small-fixes-3
Merge pull request #3650 from ussuri/small-fixes-3

Better separate in-editor FAB buttons from light backgrounds